SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ee18f1ee9af800583606af42898c4446c867266e199f9afc3b239a36358e88' 
  AND token = 'dF3gdYDuo93nx/gzKqq5M/96ihrZwJ62WycGzYaXqGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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