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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab134da56f108b5f45eeb3f837ea6866d90256fa13a23859875789b8ddbc86ee' 
  AND token = 'Bpb4oGQ96qJUskdhR7N1fvGDGa4oqu3xWbL0nSPfTw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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