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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b10f56f2b60efcc9379013e82b45a986f10dfde56418b2a3926f55275ed1dae' 
  AND token = 'uX3KORSamCiyNuvCZEUAoaQUtsOHkwqvHoAQw0yIIDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

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