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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '287b5117b3e8975904c84b1f38e6ec27463d123de8e6901625ffb52eef5c845c' 
  AND token = 'OARRfuqgX6OkUSZwxrm06mz7mwUuF0n5t8R/F3nzfj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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