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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cc737b5f3861ab3c4c1f50d6fa01193d93784281808a5ab1864139ac5b34ec4' 
  AND token = 'GtRKSyvOBGeKCeAlNM92urSyezxPKOdoyWyEqNbmk7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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