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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6eb220efcb93ab2a1b9b29fd5769f5c9260d8a45ed8fd3526b007450c3b6a6f' 
  AND token = 'Ig6pUska0eQHnRKQKIUcM7jmeNxdZ7fZoOxKOlUTjKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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