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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0beed862c80bb743027c4d3de5b9ac5a9cc7ce4bcc9797ee5328f3b6a819fe9d' 
  AND token = '7PZmPYUgH4LXowCmtkf6y1BXGOmXaOYN27Bz7YaHD/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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