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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6231ecf27055885fa8d626e6d93f1c992bfdc12b4c0794460468abfb954ac51d' 
  AND token = 'DhpzIAvtD6becceDtLYCf6irAx1a4TLzda/OCtZQcbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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