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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56fbba81d12aec4d8c718a01c1f55daa7f9ab7983068d2d1a32c43603f10a96a' 
  AND token = 'Szip11NHubplrH651+LW0loFtVIizVV3zoa9Q0xqbts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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