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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23aa3ee67103303709255d4ebaff7833a69c8bf88ba63234fa437f264819c52a' 
  AND token = '8B0Ju7bWbBqZbKu/ybHaIYpZiY8et8RAg2y70ntXeZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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