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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a855d4cbae995ed7d53bb7a961230e99d87b3b6c5416741e56e068959f4828e9' 
  AND token = 'w4zlFWoWuXbf4QDCbUICer4bmGP84U7k5h13uxrdIQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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