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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28ed80a18897a556e163198b8bdc3b4d6d1feba08a526db20a8fc57579de6efd' 
  AND token = 'j3uftAP58IYrrzAi2zmL/8lghLfGvDHP9bsG4B7h22k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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