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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd77ffcd39e04c7fb69139dc086ef8f27b7d5163ce3d066ef416f33cac56030b' 
  AND token = '+9a9/brguCfrec+19pr/HGl2jiv/SMdKU22DpYw4nfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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