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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99132fc459dedc1200532c9b47ef1e0cc53740fa44223de3ae1242ac70937bea' 
  AND token = 'JsES3HAPKyf1mF6WGt2qFTPgvaXvMMN55pvoubJ+hCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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