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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff4e34aee97e1566278b012cb44601f4883ceb73282cdd4e812c526378b8e639' 
  AND token = 'A6yZqUxoCdnWO6ubwJOne1hhZvx1BsJxP01azXBSo4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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