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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd2938f9a6b9a5f3bd70a9b671d35c8b59c134b71480a4654be94a3f9eed0aaa' 
  AND token = 'gXkgxGdx0TmTP1MaxY6IxTsWBTfV5EgFJsgedZm5BvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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