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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d06b5198e2dbc764957bda1539ed8953fe5538bbe4fb88d5f27af6bfe5e5042' 
  AND token = 'PzG5n75KAjkOhOYP73GYJEqrBNlYTXtptUM7lL3an1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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