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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b591de0551a36f04e29bbc81170973aebb4a3b87cb4664cf6135a2dc4f6a23cf' 
  AND token = 'J2IjcL7RnrJcIAQJmiilQiyX6PzKUDlOckATo2be7KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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