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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cfc3de167ab758f45ca229153514ed8c160533fb76a4980e231c37d07220b05' 
  AND token = 'ovBcdLL+bef6M9yLfgRfsDtCS76jSvAb6B3knBL4MUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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