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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '068d3c03bcb8eafe4628acc8ebc693cf7f41ecdb955cbccafbe33008552c3b60' 
  AND token = 'vyR6dn6xoeiv0NUIYyRwX7lRL4X11MzdSvKzptsAqqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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