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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0467468f4b04530d7947fffc091ffe861206e0194ca8db221ae27f88832e91bc' 
  AND token = 'EgD/WbbrNvx02B/i1yRYeBp66jqfdLo8sIums7PptF8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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