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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58bdb9dec6a1f7f14bf5c86b195bcbef04d77f22b14829fbd97a6404d0b89c77' 
  AND token = '8G8i6EgCMPjAInaBUAcEjA3bmu6VREcwZJsEykwPLQ0=' 
  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