SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa07912d68744f6f90e2d55f76fa2259f15b841731c2f1340a66699e4e2c477' 
  AND token = 'LCHTrsQ7njZFr4OtQs1JffWTmvb/mbOG+RKh5es6/Ng=' 
  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