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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199f62984ccdb877a1c8a17b309e0e5dcf85f781b6865ac9276ed6b5f0cc7898' 
  AND token = '6hInUgvZLWufx0R5HA3LmqShzPAFt8GhLOrEibRGPF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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