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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35b9036e55e3688306294f8d0979e7b184272ea6287b83047fb2433ca990d9d5' 
  AND token = 'wOEvHC7TvJcllpI1vSj0lxhd3nCAImv0t6MEBxzGc20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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