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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd175cd6da1adbc54306c27e934df7cc52a79c0127eb1676789c26e17f95ac2f8' 
  AND token = 'a/MBd7YEus7F9jEoFrxWscL/TSzQbYQ07v69WmveSA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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