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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fad399e2baaf026bc765b7db112f2ee5a79b6fc8935769db96d12da28209370' 
  AND token = 'K+1LxDgmo3eyZ4bZEUU6u/SmQbFY/XYKtEjYhWJ2Syg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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