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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f84e8f681127161f42e786084b1e334d6d375e98a3df7c2fe66cec24abe8687' 
  AND token = 'Jktdv1nPPupMNiemndqn+8330RidyOXj40tIeBTU074=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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