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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a21c0587bfedf375fa331f381413c82919afd8a88b41129aab8d4f2f407d8c87' 
  AND token = 'pa6/9o97br6EUr4Yu1dBDT1J03qvp76BBUytShn3WKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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