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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faa601f4c566c0a5bc6d41fb7ccf5a6c80734ef97b1b66b87e75541cde0eb18f' 
  AND token = 'S5I1PDlBKUNcxlf9+pnBIkQfkOKS6qt5e24LpaUb5E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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