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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c609ee426d7f1a068e209aaa42e6babc8043cf1024375c76a1e4be399a82965d' 
  AND token = 'kjpbhc+MtNcSOjyqpLnitOR6TcRZUUE4/V8mmziSDq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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