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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0343fe3546ca6f2756bb66b0512c4b8c0b9eeaa50676f2d8cc0d7624ddea6df' 
  AND token = 'GeLcn1tt5NGnlBo6X3nSFkX7tejHG5q4juES7wwG8ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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