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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e106d1eb840ce5f8324133947d5934a3cfa4f31d85886dcc88b51edaa3f4b761' 
  AND token = 'Ji2AKcFbC47u82HDwvjmWzZcBfOoHODJGRs3u6tDmwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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