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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d2606fdb1aa9d00e461e28ee34f436b93b30cc60886597c5ae2de42c8eeaf24' 
  AND token = 'Z+whIm91DksWKgJb7fFhOLeTr6YkZPLXHXqCedM8G5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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