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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ec0ca555b6cbfdd9f6acda20d54d7e6fd0c64344f61bbd6e98419243e7a497d' 
  AND token = '29e4WvOHolFTomL1RZHbX/0598aVB9vLEPdoUSSF8LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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