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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11a1eb41d93cd42a04ec2253ada045f3c30a5b8d8dd235ffacc79e9328a7910c' 
  AND token = 'smmV0kNgn0WgV32BbKHZjQk2fVWKf02PfX8rIDggwSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

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