SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b6c29ceae3d112a81c8ce425d975b7cee66ba62cffb138f988fc1984b0a77e' 
  AND token = 'YOEaoJA4B2hBrSxBz/VSQeqPd3GZ/tZ89o+6c7Rq3mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

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