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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4e5779d2264354608feb653e0f899b1574a505d42456c6d9f570047467d6cf9' 
  AND token = 'oyXoYiNZH8Pr/srXyX7gmcJPbIua9c69Mp5FN9GFyZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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