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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '529d9d9debef097e943d6278802d7dd1730011f8540b5b660fd9bfa3ab775e5c' 
  AND token = 'v7zOe8618hEjvyCilIwV8S3gMvQaJcChMg0zapx2vwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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