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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8252fa166637dea6d577737b037398e98ecd933f8deb941b7198c4cbc3e33ec8' 
  AND token = 'nMs0sHQa0WTe+iZpWYxtCbX9YfTRwObjnAmrhaK5dNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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