Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e51e3a796c0ae20a471963467fc76f3040dcd3d4e5b0a0761db0c7d989a8ff08' 
  AND token = 'RTpGzSgmnYtRWD1NB2JqNK7Llya4MvpDcDSCCV16+O0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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