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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0560325837040f69812010ab99f3e7ff39c74c59abbd16e0380cf16d2ed3d18a' 
  AND token = '1/VAoEhiLg0Hzt6hAQFC7O97s0ATbg1IcG5cqb5d/5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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