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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c203bb6e1cd44b97b2e54ae3e0e1419180d896760d03770ca518a6d9a9d9d3' 
  AND token = 'KLn7spb7IUpqS/vyJpd/B7rrtt/ErsjtF+fiPCJrwwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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