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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbf42502d21feae9da01caf57be6b916826d58b768481bcda11159c1b7677d7d' 
  AND token = 'EbLZVJAO42oaVmysRbmYUko+T+WuDZWt1mINiaT+WvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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