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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68bc77605b71f8ed8f807725320d332e6658786fb16cd511d3086223d3a60f5e' 
  AND token = 'sy84dUfriEUlL+OjNOFpYc0cxUDx2334U2xaY/lmSF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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