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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4f4e5653a1edcd0b218c652ccf5f8b6d5009ed8ecfd61b0a92da115591a50f' 
  AND token = 'ZRMowe0xPyh0fkq1xo99gMDyBaQIAW6Ui6d0KHVvmQo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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