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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503c8b8a8ee8cb2348ef8f372dcb7d0f9968cee47218218816f9c9f29a7e1eac' 
  AND token = 'zxoxTldl/505Onnfz6Nfblrv/XgVu3cyIPp0aom2nxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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