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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69afce3931f141affcc3435b8d5c7d4ff020304e848a7650ffcc3ef663071410' 
  AND token = '0ic15dmceRtGLNKsI0AU1fW+DPXtJw4vNmbDNYmQmm4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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