SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb8533869e0ccf2a9443db204b53fe96630cedcd028335f01e7fc1852485d641' 
  AND token = 'L5PWv9ittjYDy3+gCozTH/UCywcvva1udh5tU63bmcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

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