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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a61f902b2db607464e0c703f781ed16d36b33f83937d8e27daaaacd9119df96' 
  AND token = 'z9PAu3faaeY9J9fx1dtvJPZ9C314vaSiucNZl56Y6lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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