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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb65f3de4e9651730cd5144f0ecfdec1672ce46d14a208242b5e5a9c9bafa62b' 
  AND token = 'ArcE3YT6Pvt7XQQvsFS/HwbKG7qZahtDHS6u0fvcaCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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