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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82b3eb196e6ca45aba058240da1a3446cd3cebba16a120124b23a09d364e5472' 
  AND token = 'uT8Sv1cxCpDkkcmItrOiTqBeGKSa8TG3CAt1xG2Zkcw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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