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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5d7bc11051f77b81db59ed32827abfbb49498a7642bd7e5ed50338bf3c540ba' 
  AND token = 'Jlu2VfrOIbZyPm+WdR5vtCWzCAUWPpIaHFSH2Nf9p/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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