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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b87deae23056fe47988f6f10bf4bcf31557d3f293ff09dd45969028878ea2d36' 
  AND token = 'I52wonM72aLZZvXB8EBeHw1hh94KNRQnp0d1GqTk5Kc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE								Impossible WHERE noticed after reading const tables