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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a77aa7c76bf4eb75f5862fea088f6fadc5d5450d56cb935e06313d229f14659' 
  AND token = 'sTXAVfDrwJ2KaJO2CSJZd6RNwX65zyGpTdjtj2B9hWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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