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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac1a9163c2915b9f452902608f45789c203b796da7320ae6263e703e39061321' 
  AND token = 'zwGYxw+ifgAiACcifcLXH/aRCb/ESsSRI4OECFxzaVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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