SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a71440c10a27e38c7e49a5d5f8ad707ea8d18b7359cb9ee7a3b02bf3ed676a2' 
  AND token = 'GQNTCJH4xk39M+ctcCrCltlNtZm5HT3XXhhdXsEEhI4=' 
  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