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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8df623cc0c248a91021df611ed67d80bc7e997d8ae03a2915f8c8d0b61cbc98' 
  AND token = 'hwvu1NB89DbF+dUtbWFJwBpw9ud5wLhzoIk7DlwaoiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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