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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e19a1043bd4203ee2d7e7849e3d10cc37f984cb683894f49748968d3d3ac6b8' 
  AND token = '77KM2UDOlBZB+paejuJga61Qr1NnKQth5j+ks7aPlz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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