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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '828e0681f44b1278fc7f74eed2d9e487e84f3bf9c95351653cf531643f7901fc' 
  AND token = 'Dx/9ubRGYkuKSWSTkh8spUKL9AvVbef4Ui+rsXynhi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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