SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a33d25ca06c119cca2245bc72ad3b097e9467ab817a5b77d0944fd55ce36975f' 
  AND token = 'RB0EPhYNb6uc7gnXbbz/j6G4M1HyuIiRV+iKVQCUI28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}