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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e92bd8430983b27f1dd6b387d51e0b304569e7f26ae501bd96396859d370f11' 
  AND token = 'bCWmXF1p5ALypWib2Y3SJ7zxu4Dd+/R/GCII06rmQZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

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