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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a713cb8862d1f0484a95d962ce154a4a5b98487ff3978eb08dc40f9802f772a9' 
  AND token = 'L11s7l46PE1mlBaSUzsw7cJ7vhnjLKxo73mlX9t9PCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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