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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06e67e8ecf86745a168478d6794df65962bede56dbf5289e2097744e914f5a9' 
  AND token = 'dpx7DKogNpLn1x6MVQT3N9UBw5fncOAjjl8I/nioSvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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