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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87f7f4ab48db13c3cca09790a0251daa75fed21ff1708456d9ef562a03fa9922' 
  AND token = 'wFY09Dg5Hy2sTjqou4d+roK0KK+Xwem5XfySC+WNzlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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