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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a79d2fc4a06b4563948233e0a4d0191dd67164d3bcc4ffcf21e6cd953e9f3676' 
  AND token = 'MwJj2MwTcty7kwao+kCdV1xXsZE7MOgDO9F7elWRWQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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