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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f17bce6af49e3b704f387a502756afece5eb70ec9525da500114efa07a4937b2' 
  AND token = 'pqSr6WPIDdBW88pBu1D6BAJeOdPkDeuIWvnfQr1NaVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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