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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd22a70c784f553846b7e099a6e3588c121417c7dec9c6248fc7960ba55e6f5' 
  AND token = 'FuCsFVShMu2kdEzw9tkQA59Xy4IwGqfAN+LeJQE6voI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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