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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d9dc718b16e84fe2b6446411d87180b9868662e29450c710e58d64570421fdf' 
  AND token = 's6TshDUdF+Tk+Sv+/Yvkt6F8Ig70tglrhWOYHwSmefk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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