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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8a686cc7577ae9f4732f58f02a280350c5fc45d852590fdd6de82352afd31b' 
  AND token = 'mmuyg/dm9NL5J17lTsAjr5JGcBLxu9aJ1XPyzH9ogcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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