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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f1fb5ad89859f0a40c9bdda0b04e442e40359264082a609bd1d9d3363efef1b' 
  AND token = 'TFwgn8onmKzz2O8vKxSCR3pvOARaW4CEM3+CJZb+XnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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