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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91c86c458aaf52b32a477787c6ca4921b0f6aef5c9d7da06ea0905f37f2ee39e' 
  AND token = '92oBj17zWakA6qSjPPfHHE+xCS0GsRVRKtjzWBz+LXY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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