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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffc99d79f7d94e43951b19904577644fee87bd60d20f31cb5647901243ce4eb7' 
  AND token = '3dQ93vVCulin5TbWNkuxUS43mH7EBeKTeqqtvNJw3Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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