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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '655c0564c99a3d38f3b860b8f648dbc90dc79427a94f2b33b950a5670d433eae' 
  AND token = 'pC841wIA4xhTuasPPYLkcZThnnfTzq78XcwluYT5mCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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