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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30ce6b3d1681bf3427e212a21728aee732f6cb1ee609e13d58b5b79946b9e07f' 
  AND token = 't1WshCKyCpqVUQ9T8cpEHuiaM0OzTQPe2Zwxx8MR2vc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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