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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b028f3cddd003e36980adb63abed027bdea7a4685f98370a78aa59237a5006e' 
  AND token = 'DMCurJ7fcmuCjDbhbLxia8dIzRIHHWyl1VxGN9pfOog=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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