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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfc98bf39efddc0b19e7855e02f002f64490a1502da2b2f20c273bc102dd16cb' 
  AND token = 'Xw2nMB71jWifM2JoF9K3XhbOckf3+jzqPhW5IwfgA/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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