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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a63388446af3274f4067f7a3d4151f590f42b15ec669e649fcc8d2938904263' 
  AND token = 'IGfkCjrdo3J76PnO3BTpC2i2yu1B6Z63FsO3DsOHUGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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