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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db503c1ce2ad3a1a715f78ae2c550228bb4cfe1edd1fd5cf05ca7d808ac8107d' 
  AND token = '9rpp6SlrrPgEeHtIHFYCAubO90A8sPUhP7feWHZTOn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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