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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9654d218ac3bf7360b76d2d8b9d311d88e218dad6fc5ba936e7aca81ef800f7' 
  AND token = 'eLftGYi2FMr7fha7OoBnLklS+aHmoDN/wphTkJA6iJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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