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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fd91c627754bc0d494f971a925b9f07f731e0648e4300ee94e42f889e92b555' 
  AND token = 'Tprt0b+xfUBVYESganBLiPx1M3wrVuDg+jO7oNS1H8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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