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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0459308f3a1fcebc2aa54c7fd0e0324f7ccc850aa7079ff144a3e8ed79d4d9' 
  AND token = 'yN+sSzmx2IlGfQolKzDzlbQbs3TyFJewn7P+RYt1tTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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