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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47addba36befdf5b065038b06d62e28b0828d6f8e61985a16124bbe26495d6e2' 
  AND token = 'qkXsmJZGpMz6r/8DsTeScGFDTwu1ewGCFqPV1On3UWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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