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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c36f2d42f075eebfdca6ef50077374a9523209ba2bae00f5d808cbff31d9ea12' 
  AND token = 'gPJLIhSD3fGdPg22rWl9WqnZ7tnAOcwPMcOgGGNvzK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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