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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7938d3c24d93629ba804db95908d1d22148454c5a4b79f657afd51adf69481f3' 
  AND token = '6yrrWZG6EU/reiRCwqhNNLrY0nWpSvSazhXv83TL5a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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