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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a10f5861c8ea938076ad67d528af6912097727f90bcd5a21b6f7184c091595ef' 
  AND token = 'carNh6PP5SBEqDS1TH2rCyQouaGKJUslSoj57PTZJ0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

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