SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1cd9625f1df2b5d73aaf6548670cd94a13bf6c2ac8865893c198d4b1e5d2543c' 
  AND token = 'cjj91jdPfNTiFP/g0VJzYTI0yT0FOmUqv3MLBVXmSwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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