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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8255661666d64933309424644e3fa75c92a85802a390bda562fb136a003997de' 
  AND token = 'DCbyu7qrgFaHuc7Zm9Ste+310lZ/InOaHB1lvYdIvVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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