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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76912cbba050e3c0acf1b93f1e6739ef6a097abc78e1958fb75fac8b8ae37c9a' 
  AND token = 'Cbzii6efRFGaQsgidRCyhNRK2MeEKjpYZHuZoqXQIIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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