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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6de930448b65158819923b58c2b516626b09aecb7468bf0bc6a698e401468345' 
  AND token = 'h3g4cbwp8jUStKvWLvTb1m6FIze3UwqO8quOLwsPN/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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