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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '465596fd37f32a9e41718b17ed6dd7296ce74bcee2adb4009024954d078169bb' 
  AND token = 'RT3ofnNAtevISa0sVZTON/gphfVTJCvvQ+vt1ydWkcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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